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Strong pseudoprimes to base 18.
1

%I #11 Aug 04 2015 06:19:47

%S 25,49,65,325,343,1369,1387,2977,4577,5725,5833,5941,6601,11425,12025,

%T 18631,22411,28153,29341,30889,35425,39817,40501,41159,49141,60685,

%U 60691,74425,80137,90751,99451,101905,104653,104977,109561,111151,111841

%N Strong pseudoprimes to base 18.

%H R. J. Mathar, <a href="/A020244/b020244.txt">Table of n, a(n) for n = 1..201</a>

%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>

%K nonn

%O 1,1

%A _David W. Wilson_